/**
 * Copyright (c) 2016 Razeware LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */


import UIKit
import CoreLocation
import MapKit

class LocationViewController: UIViewController {
  @IBOutlet var mapView: MKMapView!
  
  fileprivate var locations = [MKPointAnnotation]()
  
  private lazy var locationManager: CLLocationManager = {
    let manager = CLLocationManager()
    manager.desiredAccuracy = kCLLocationAccuracyBest
    manager.delegate = self
    manager.requestAlwaysAuthorization()
    return manager
  }()
  
  @IBAction func enabledChanged(_ sender: UISwitch) {
    if sender.isOn {
      locationManager.startUpdatingLocation()
    } else {
      locationManager.stopUpdatingLocation()
    }
  }
  
  @IBAction func accuracyChanged(_ sender: UISegmentedControl) {
    let accuracyValues = [
      kCLLocationAccuracyBestForNavigation,
      kCLLocationAccuracyBest,
      kCLLocationAccuracyNearestTenMeters,
      kCLLocationAccuracyHundredMeters,
      kCLLocationAccuracyKilometer,
      kCLLocationAccuracyThreeKilometers]
    
    locationManager.desiredAccuracy = accuracyValues[sender.selectedSegmentIndex];
  }
}

// MARK: - CLLocationManagerDelegate
extension LocationViewController: CLLocationManagerDelegate {
  
  func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    guard let mostRecentLocation = locations.last else {
      return
    }
    
    // Add another annotation to the map.
    let annotation = MKPointAnnotation()
    annotation.coordinate = mostRecentLocation.coordinate
    
    // Also add to our map so we can remove old values later
    self.locations.append(annotation)
    
    // Remove values if the array is too big
    while locations.count > 100 {
      let annotationToRemove = self.locations.first!
      self.locations.remove(at: 0)
      
      // Also remove from the map
      mapView.removeAnnotation(annotationToRemove)
    }
    
    if UIApplication.shared.applicationState == .active {
      mapView.showAnnotations(self.locations, animated: true)
    } else {
      print("App is backgrounded. New location is %@", mostRecentLocation)
    }
  }
  
}

